Rim-latch.



P. SEISLER.

RIM LATCH.

APPLICATION FILED MAR. 2s, 1910.

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PHILIP SEISLER, OF READING, PENNSYLVANIA, ASSIGNOR TO THE CHANTRELL HARDWARE & TOOL COMPANY, OF READING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

RIM-LATCH.

Specification of Letters Patent.

Patented J une 28, 1910.

To all whom it may concern:

Be it known that I, PHILIP SnrsLnR, citizen of the United States, residing at Reading, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Rim-Latches, of which the following is a specification.

This invention relates to improvements in rim latches t-he object being to provide means for positively dead locking the latch bolt, so as to overcome the possibility of actuating the bolt from the outside, as by means of a knife blade inserted between the lock and catch. I accomplish this object by so constructing the latch that when the bolt is moved by means other than the turning of the knob or key cylinder, that is, when it is operated by the closing of the door, the bolt will be automatically dead locked against any movement whatever, other than by the key from the outside or the knob from the inside.

The invention is more fully described in the following specification and clearly illustrated in the accompanying drawing, in which Figure 1 is a rear face view of the lock with the rear plate removed, with the latch bolt in its outer position. Fig. 2 is asimilar view with the latch bolt in its normal position when the bolt is dead locked. Fig. 3 is a cross-section through X-X of Fig. 1. Fig. t shows the under side of the tumbler and locking lever in locked position.

The numeral A1 designates the casing. This is provided with the usual latch bolt 2 formed with the usual spring backed parallel stems 3 adapted to be moved in either direction by means of roll backs 4 one of which is operated by the knob and the other by the key cylinder. This is the usual or ordinary latch construction.

In my present device I provide a simple construction to positively dead lock the latch bolt, in the form of a pivotally mounted spring backed tumbler 6, adapted to be held normally out of the path of the latch bolt, but to be thrown into locking position therewith when the bolt is operated by the closing of the door or by any means other than by the turning of the knob or key cylinder. This tumbler comprises a body portion 6 having a pin 7 at its rear end projecting at right angles to the body and adapted to be engaged in recesses 8 in the curved faces of the roll backs 4:. The tumbler is pivotally mounted on a pin 9 in the casing at its rear end. The forward end of the tumbler is provided with an irregular opening 10, having an offset 12 adapted to engage a lug on the locking lever, as will be described later. The extremity 13 of the tumbler is in line with the body portion, is narrower, and is adapted to be thrown into the path of the latch bolt when the tumbler is released. On the opposite side of the casing, on a pin 14, I secure pivotally, a spring backed locking lever 15. This lever crosses and rests upon the upper surface of the tumbler 6 at the point of the opening 10 and it is formed with a depending lug 16 on its under face which rests normally in the offset 12 of the opening in the tumbler.

l/Vhen the key cylinder or knob is operated, actuating the bolt through the roll backs, the bolt is withdrawn in the usual manner; this action of turning the roll backs against the pin 7 will tend to keep the tumbler out of the path of the bolt at all times, and it will also slightly raise the free end of the tumbler and with it the locking lever, so that the latch boltwill be free to move freely underneath them. Vhen however, the latch bolt is operated from the outside, as when the door is closed, the bolt will, at the beginning of its movement inward, Contact with the lug 16 on the locking lever 15 and release it from its engagement in the offset 12 of the tumbler. This release will cause the tumbler, through the action of its backing' spring, to be thrown forward at its free end and the extremity 13 thereof will enter the path of the bolt and stop its inward movement by contacting with a shoulder 17 thereon. In this position the bolt cannot be moved by any other means than the turning of the knob or key cylinder, and when so operated, it will, through the contact of the roll backs with the pin 7 on the rear end of the tumbler, throw the forward end thereof out of the path of the bolt and permit its movement. llfhen thrown out of the dead lockingl position by the action of the key or kno-b as just described, the tumbler will be engaged by the locking lever and hold it in normal locked position again, as shown in Figs. 1 and t, by means of the lug 16 entering the offset 12 in the tumbler.

Having thus fully described my invention, what I claim and desire to secure by Letters Patent is :M-

In a rim latch a casing7 a bolt, means for actuating the bolt comprising independently operated roll backs, a spring backed, pivotally mounted dead locking tumbler 6 formed with a pin at its rear end projecting at right angles to the body and adapted to engage the roll backs, said tumbler having an irregularly shaped opening in its body portion forming an offset therein; a pivotally mounted locking lever lying across and resting on the upper surface of the tumbler1 at the point of the irregular opening,` a depending lug formed thereon adapted to engage the oliset in the tumbler to hold it out of deadlocking position7 and means for releasing the engagement of the lever With the tumbler when the bolt is operated other than by the roll backs.

In testimony whereof I aX my signature, in presence of tWo Witnesses.

ED. A. KELLY, ARTHUR T. MCCOY. 

